Degenerative Disc Disease: Causes, Symptoms & Treatment Options

Diagnosing Degenerative Disc Disease: Facing the 800-Pound Gorilla

Accurately diagnosing Degenerative Disc Disease (DDD) is both an art and a science. It requires a thoughtful combination of detailed medical history, comprehensive physical examination, and advanced imaging techniques like MRI or CT scans. But here’s the challenge — while imaging can reveal disc degeneration, these findings are often present in people who have no back pain at all.

This disconnect between what we see on scans and what patients feel makes diagnosing discogenic pain far more complex than simply pointing to a degenerated disc on an MRI. In certain nuanced cases, tools like provocative discography have been used in an attempt to pinpoint the exact source of pain, particularly when multiple degenerated discs are visible. However, even these approaches come with controversy and limitations.

We could easily turn this discussion into an entire textbook chapter — but it’s impossible to ignore the central question every patient and clinician faces when dealing with chronic back pain:

“How do we truly determine if your back pain is coming from Degenerative Disc Disease?”

Discogenic Vs.Vertebrogenic Pain

Although they may sound similar, discogenic pain and vertebrogenic pain are not the same. Understanding their differences is essential for accurate diagnosis and treatment planning. There is an overlap between this article and the the vertebrogenic pain article.

🔹 Discogenic Pain

Discogenic pain arises from the intervertebral disc itself, particularly the outer annulus fibrosus, which is innervated by the sinuvertebral nerve. This type of pain is often triggered by:

• Annular fissures or internal disc disruption
• High-intensity zones (HIZ) on MRI
• Intradiscal pressure (e.g., sitting, forward flexion)

HIZ

🔹 Vertebrogenic Pain

Vertebrogenic pain is a more specific clinical diagnosis that refers to chronic low back pain originating from endplate damage and inflammation, mediated by the basivertebral nerve (BVN).

Key features include:

• Presence of Modic type 1 or 2 changes on MRI
• Inflammation at the vertebral endplates
• Not caused by disc herniation, facet joints, or sacroiliac joints

This condition is often treated with the Intracept Procedure, which involves radiofrequency ablation of the BVN.

Unlike vertebrogenic pain, discogenic pain may be confirmed by provocative discography (controversial issue) and is typically addressed using regenerative therapies (e.g., PRP, stem cells) or intradiscal electrothermal therapy (IDET), or biacuplasty.

🔹 Key Anatomical Differences

✅ Clarifying Statement

Stages of Degenerative Disc Disease and Endplate Involvement

Degenerative Disc Disease (DDD) is a progressive condition in which intervertebral discs lose hydration, elasticity, and structural integrity over time. This degeneration places increased stress on adjacent vertebral endplates, often contributing to vertebrogenic pain.

Common Stages of DDD Progression:

1. Stage 1 – Early Disc Dehydration: Nucleus pulposus begins to lose water content. MRI shows mildly decreased T2 signal. Patients may have little or no symptoms.
2. Stage 2 – Disc Narrowing and Annular Fissures: Disc height starts to reduce. Small annular tears may develop. Endplates show signs of early stress and inflammation.
3. Stage 3 – Advanced Degeneration: Disc collapses. There is significant loss of height and signal. Endplates appear sclerotic or eroded. This stage is commonly associated with Modic changes and vertebrogenic pain.
4. Stage 4 – Segmental Instability and Facet Arthropathy: Severe disc collapse causes abnormal motion and facet joint overload. May lead to stenosis and nerve root involvement.

Modified Pfirrmann Grading Scale (Grades 1–8)

The Modified Pfirrmann Scale is a widely used MRI grading system for lumbar disc degeneration. It assesses disc hydration, signal intensity, structure, and disc height. A modified classification was proposed in 2007 by Griffith et al. to better categorize degenerative discs in older patients where most discs are Pfirrmann grade III or IV. It has, however, not been as widely adopted.

Integration into Clinical Decision-Making

Recognizing whether a patient’s axial pain is discogenic or vertebrogenic helps guide the therapeutic approach:

• Stages 2–5 Pfirrmann: More favorable for regenerative intradiscal therapy
• Stages 6–8 Pfirrmann: Often associated with Modic changes and vertebrogenic pain → Intracept is more appropriate

Self-Assessment Scoring Tool

This simple point-based system helps non-specialists gauge whether their low back pain may be discogenic or vertebrogenic in origin. While not diagnostic, it can encourage appropriate next steps:

• 1 point: Persistent midline low back pain (axial)
• 1 point: Absence of radicular pain or sciatica extending past the knee (learn more)
• 1 point: Pain duration >3 months
• 1 point: Pain worsens while sitting
• 1 point: Pain worsens during forward flexion
• 1 point: Pain improves with standing
• 1 point: MRI shows Modic changes (Type 1 or 2)
• 1 point: MRI shows high-intensity zones or annular tears
• 1 point: Facet joint syndrome ruled out via diagnostic medial branch block
• 1 point: SI joint dysfunction ruled out via diagnostic SI joint injection

Interpretation:

• 0–4 points: Low probability — conservative care may be sufficient
• 5–7 points: Moderate probability — likely structural pain generator; clinical imaging and expert evaluation recommended
• 8–10 points: High probability — strong candidate for advanced diagnostic workup, including targeted image-guided injections

Note: This tool is an educational guide and not a substitute for formal clinical diagnosis. Accurate evaluation requires high-quality spine MRI, physical examination, and expert correlation using validated diagnostic techniques.

Intradiscal Regenerative Medicine Options for Degenerative Disc Disease

Emerging regenerative therapies offer promising alternatives to traditional treatments for Degenerative Disc Disease (DDD). Below is a comparison of three notable intradiscal regenerative options.

1. Platelet-Rich Plasma (PRP)

Overview: PRP involves concentrating a patient’s own platelets and injecting them into the degenerated disc to promote healing.

Evidence: A study demonstrated significant pain relief and improved lumbar function over a 48-week period following intradiscal PRP injections. [Study Link]

2. Bone Marrow Concentrate (BMC)

Overview: BMC is derived from the patient’s own bone marrow and contains stem cells and growth factors that may aid in disc regeneration.

Evidence: Research indicates that intradiscal BMC injections can lead to significant improvements in pain and disability scores, with sustained benefits observed over a three-year follow-up. [Study Link]

3. Wharton’s Jelly Mesenchymal Stem Cells (WJ-MSCs)

Overview: WJ-MSCs are derived from the gelatinous substance within the umbilical cord and have shown potential in regenerating degenerated discs.

Evidence: Animal studies suggest that WJ-MSC transplantation can maintain disc height and promote matrix formation, indicating their value in treating DDD. [Study 1 Link] [Study 2 Link]

Comparison Summary

FDA Disclaimer: The regenerative therapies discussed are considered investigational and are not yet approved by the U.S. Food and Drug Administration (FDA) for the treatment of Degenerative Disc Disease. Patients should consult with their healthcare providers to understand the potential risks and benefits.

Is Spinal Fusion a Permanent Solution for Degenerative Disc Disease?

Spinal fusion is often considered when severe Degenerative Disc Disease (DDD) leads to chronic pain unresponsive to other treatments. While fusion can reduce pain by eliminating motion at the degenerated segment, it is important to understand that it does not reverse disc degeneration or “cure” DDD.

Does It Get Better Forever?

For some patients, spinal fusion provides long-term pain relief. However, fusion alters spinal mechanics, often leading to a condition known as Adjacent Segment Disease (ASD), where discs above or below the fused segment begin to degenerate due to increased stress. Therefore, while spinal fusion may improve symptoms at one level, it can predispose patients to future spine problems. It is not typically considered a “permanent fix” for the spine overall.

The United States and Spinal Fusion Rates

The U.S. performs the highest number of spinal fusion surgeries worldwide. Studies show that spinal fusion rates in the U.S. have increased by over 300% in recent decades [Spine Journal]. Compared to countries like Sweden, the UK, or Canada—where stricter surgical criteria are applied—the U.S. healthcare system sees more frequent use of fusion, sometimes raising concerns about overuse.